alluvial and wind-blown soils, including highly plastic volcanic ash and a high water table, were present at the site. In 1990, Williams evaluated several design alternatives for the adjacent retail site, and decided to use a layered system of T ensar ® geogrids. This system, a precursor to today’s Dimension™ Foundation Improvement System, interacted with structural fill soils to create a stiffened platform over weak, compressible soils. That d

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